Adjustable reamer.



Patented Nov. 17, 1914.

2 m A h 1- A A W S. A. FOX.

ADJUSTABLE RBAMER.

P n -HH II A. H V .555 in m F Ewi APPLICATION IILBD AUG. 31, 1914 1,117,946.

THE NORRIS F'ETERF CO. WASHINGTON, D. C.

ilhliTED STATE PATENT OFFICE.

SAMUEL ALEXANDER FOX, 0F HAMPSTEAD, LONDON, ENGLAND.

ADJUSTABLE BEAMER.

Application filed August 31, 1914.

To all whom it may concern Be it known that I, SAMUEL ALFxaNnnn Fox, asubject of the King of the United Kingdom of Great Britain and Ireland,and residing at 29 Belsize Crescent, Hampstead, London, N. 'W, England,have invented new and useful Improvements in Adjustable Reamers, ofwhich the following is a specification.

My invention applies to that type of reamer for machine or hand use,which is provided with loose blades, which are located in slots in asubstantially cylindrical shell, and which can be moved in or outradially in relation to the axis of the shell by means of internalmechanism provided for this purpose.

The purposes of my invention are to secure in reamer-s of this class anouter shell stiffened by its particular form and section to withstandeffectively the tendency to dis tortion under the action of the cuttingstresses, and to obtain a range of adjustment of the cutting bladessufficient and capable of being readily and quickly made to anypracticable degree of refinement.

My improvement according to the pres ent invention consists in providingthe shell of adjustable reamers of the aforesaid type with an internalmember, such as a partition, wall, flange or bridge interconnecting ator about the middle of their length the shell segments situated betweenthe blade slots, said member preferably being integral with said shellsegments.

A further improvement consists in the provision in reamers of theaforesaid type of a plurality of cones movable relatively to one anotherand means for adjusting the same with a view to effecting the radialadjustment of the blades.

Two embodiments of the present inven tion are illustrated by way ofexample in the accompanying drawings.

In said drawings :Figure 1 is a vertical longitudinal section through areamer constructed according to my invention. Fig. 2 is a transversesection on the line IV-IV Fig. 1.

Referring to the drawings, the reamer consists of a shell 1 having slots2, 2 at its periphery and having axial recesses 3, 4 at its endsseparated by the member 5 which is in the form of a partition, wall,flange, or annular bridge, which interconnects at or about the middle oftheir length the shell seg- Speeification of Letters Patent.

Patented Nov. 17, 1914.

Serial No. 859,450.

through which the shank of the bolt 17 passes. The end of said shank isprovided with a screw thread 20 and a nut 21 engages with the same. Saidnut has a keyway 22 in which the head 23 of the featherpin 2% engages,so that said nut can not rotate relatively to the shell but can moveaxially with regard to the same. The blades 25 are of the shapeillustrated, their ends 26 always abutting, when in position, againstthe adjacent ends of the slots in which they are situated. 27 is alocking collar for locking said blades when adjusted.

To adjust the blades the collar 27 is slackened, the bolt 18 is turneduntil the nut 21 has moved vertically relatively to the bolt through thedesired amount to allow the cones to be the required distance apart togive the blades the proper radial adjustment. The collar 27 is thentightened to lock the blades in position.

It will eb understood that instead of the bolt 17 having a conical headit might have a head of any suitable shape, and be provided with a loosecone similar to the cone 19.

What I claim as my invention and desire to secure by Letters Patentis 1. An adjustable reamer comprising a shell having a plurality ofslots at its periphery, blades in the slots, a bridge having a centralopening connecting the walls of the shell between the slots, a bolthaving a threaded portion extending into the shell and projectingthrough the opening in the bridge, cones on the bolt for engaging theblades, a nut operating on the threaded portion of the bolt, said nutadapted to move one of the cones when the bolt is moved and means forpreventing rotary movement of the nuts.

2. An adjustable reamer comprising a shell said shell having a pluralityof radial slots, a blade in each slot, a bolt extending into the shell,said bolt having a cone head and a threaded portion, a cone on the bolt,said cones adapted to engage the blades for moving the same, a nutoperating on the threaded portion of the bolt, for moving the lastmentloned cone, and means for preventing rotation of the nut.

3. An adjustable reamer comprising a shell having a plurality of radialslots, blades operatin in the slots, a bolt eXtend ing into the shell,an integral cone on the bolt, said shell having an opening in the wallthereof, a nut on one end of the bolt, saidnut having a longitudinalslot, a key in the opening in the wall of the shell, said lo lies ofthis patent may be obtained for five cents each, by addressing theCommissioner of Patents,

Washington, I). G.

